#include <stdio.h>

#define SIZE 10

int sum(int ar[], int n);

int main(void)
{
    int marbles[SIZE] = {20, 10, 5, 39, 4, 16, 19, 26, 31, 20};
    long answer;
    answer = sum(marbles, SIZE);
    printf("The total number of marbles is %ld.\n", answer);
    printf("The size of marbles is %zd bytes.\n", sizeof marbles);
    return 0;
}

int sum(int ar[], int n)
{
    int total = 0;
    for (int i = 0; i < n; ++i)
    {
        total += ar[i];
    }
    printf("The size of ar is %zd bytes.\n", sizeof ar);
    return total;
}